Gamow-Teller transition strengths from the 11B(p,n)11C reaction in the energy range 160--795 MeV

Zero-degree cross sections have been measured for the 11B(p,n)11C reaction at bombarding energies of Ep=160, 200, 494, 644, and 795 MeV. In addition, spectra have been obtained at laboratory scattering angles of 3 degree and 5 degree at 494 MeV, and the transverse spin-flip probability at zero degrees has been measured for Ep=160 MeV. These data are used to obtain estimates of the Gamow-Teller transition strength to final states in 11C up to an excitation energy of Ex≅14 MeV. The uncertainty (1 standard deviation) in the extracted transition strengths is estimated to be in the range (2--8)%. Measured cross sections for the first four excited states in 11C have been compared to distorted-wave impulse approximation calculations. In this comparison, no evidence is found in the cross-section data for certain effects associated with knock-on exchange and noncentral interactions